????????
      +---------
A686F | E8448353
       -C5F5E
        =====
        A0D303
       -A423CD
        ======
         4C85A5
        -46BEB3
         ======
          04F963
         -014217
          ======
          ??????

base: 16
letters: 0123456789ABCDEF
difficulty: medium